How to join two table in codegnaiter

1 model )

$this->db->select('*');

$this->db->from('testing');

$this->db->join('tb1','tb1.id=testing.id');

$this->db->where('tb1.id =  ','1');

$data=$this->db->get();

$query= $data->result_array();

return $query;

2 Controller)

$this->load->model('index_model');

$query=$this->index_model->get_post();

$data1['post'] = $query;

// print_r($data1);

$this->load->view('home',$data1);